The short answer
Long-term liver damage is the main driver of liver cancer risk. Hepatitis B or C infection, cirrhosis, heavy alcohol use, and fatty liver disease raise risk. Vaccination against hepatitis B and treating hepatitis C lower risk.
Long-term liver damage is the main driver of liver cancer risk.
Chronic hepatitis B or C infection raises risk.
Cirrhosis from any cause raises risk.
Heavy alcohol use and fatty liver disease raise risk.
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The full explanation.
Liver damage is the common thread
Most liver cancer risk factors share a mechanism. They injure the liver over years. The liver's repeated attempts to heal that injury raise the odds of cancerous change. This is why cirrhosis sits at the center of the picture. Cirrhosis is scarring from long-term liver damage. Most people who develop liver cancer already have cirrhosis by the time they are diagnosed.
Viral hepatitis: the leading cause worldwide
Chronic infection with hepatitis B or hepatitis C virus is the most common risk factor for liver cancer worldwide. Both viruses cause ongoing inflammation in the liver over years or decades. That can lead to cirrhosis, and eventually, cancer. This is part of why hepatitis B vaccination and hepatitis C treatment count as liver cancer prevention. They are not just infection treatment. If you have never been tested for hepatitis B or C, ask your doctor whether you should be.
Alcohol and fatty liver disease
Heavy, long-term alcohol use is a leading cause of cirrhosis in the United States. Cirrhosis from any cause raises liver cancer risk. A newer and increasingly common cause is metabolic dysfunction-associated steatotic liver disease. Some still call this fatty liver disease. This happens when fat builds up in the liver. It is often linked to obesity and type 2 diabetes. It can progress to inflammation, scarring, and eventually cancer, even without alcohol as a factor.
Weight, diabetes, and smoking
Excess body weight raises liver cancer risk. This works largely through its link to fatty liver disease. Type 2 diabetes raises risk too. This matters most when combined with obesity or heavy alcohol use. Smoking also raises risk. People who quit have lower risk than people who continue. That makes this one of the more directly changeable factors on this list.
Aflatoxin and chemical exposure
Aflatoxin is a toxin produced by mold. It can contaminate improperly stored grains and nuts. It is a known risk factor, more common in certain parts of the world than in the United States. Long-term exposure to certain industrial chemicals also raises risk. This includes vinyl chloride and thorium dioxide, mainly in specific occupational settings. Long-term use of anabolic steroids carries a slight increase in risk as well.
Who is affected most
Men develop liver cancer more often than women. In the United States, Asian American and Pacific Islander people have the highest rates. Hispanic and Latino, American Indian and Alaska Native, Black, and white populations follow, in that order. These differences largely track with rates of hepatitis B infection and other risk factors within each group. They do not reflect anything inherent about race itself.
What you can act on
Several of the biggest risk factors here are addressable. Get vaccinated against hepatitis B if you have not been. Get tested and treated for hepatitis C. Limit alcohol. Manage weight and diabetes. Do not smoke. None of these guarantee you will avoid liver cancer. Still, for a cancer this closely tied to preventable liver damage, they meaningfully shift the odds. If you have cirrhosis from any cause, ask your doctor about regular monitoring. Catching liver cancer early dramatically changes what treatment can do.
What to ask your team
- Have I been tested for hepatitis B and C, and should I be vaccinated against hepatitis B?
- Do I have cirrhosis or fatty liver disease, and if so, should I be monitored regularly for liver cancer?
- How does my weight, alcohol use, or diabetes affect my personal risk?
- What symptoms should prompt me to call you sooner rather than wait?
Sources
Words to know
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Common questions
What raises liver cancer risk?
The main risk factors involve long-term liver damage: chronic hepatitis B or C infection, cirrhosis (liver scarring), heavy alcohol use, and fatty liver disease. Older age and being male also raise risk.
How does hepatitis affect risk?
Long-term hepatitis B or C infection causes ongoing liver damage that can lead to cancer over years. It is one of the most important risk factors worldwide.
Can risk be lowered?
Yes. Getting vaccinated against hepatitis B, getting tested and treated for hepatitis C, limiting alcohol, and keeping a healthy weight can all lower risk.
Should higher-risk people be screened?
People with cirrhosis or chronic hepatitis may be offered regular screening to find liver cancer early. Ask your doctor if screening is right for you.
Questions to ask your doctor
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Sources last checked: 2026-07-21 what this meansLast updated: 2026-08-05Next planned review: 2027-07-21
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How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes. We do not employ clinicians and do not intend to — our work is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and checked line by line against the sources listed on it. That confirms the sources support what the page says. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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